Woodworking-tool



A. HUNTER.

WOODWORKING TOOL.

APPLICATION FILED SEPT. 30 1918.

1,322,572., Pa tentod Nov. 25, 1919.

anmmwoz ALBERT HUNTER, OF VANCOUVER, WASHINGTON.

WOODWORKING-TOOL.

Specification of Letters Patent.

Patented Nov. 25, 1919.

Application filed September 30, 1918. Serial No. 256,304.

To all whom it may concern:

Be it known that I, ALBERT HUNTER, a citizen of the United States, residing at Vancouver, in the county of Clarke and State of Washington, have invented certain new and useful Improvements in Woodworking-Tools, of which the following is a specification.

The present invention relates to improvements in wood-working tools, and particularly to a power driven chisel or dubber for special work on the hull of a wooden vessel, taking the place of the manually operated adz or dubber, but of course the tool is applicable for use in other waysand the chisel or edge tool illustrated in this eXempl1fication of the invention may be replaced for other tools when desired. I

The primary object of thQ lIIVGHtIOH IS the provision of a wood-working tool that 1s power driven and is attachable with facility to the well known type of rivetmg or hammering machine of the pneumatic type from which it receives its power.

The prime feature of the invention 1s to provide means to prevent the tool from being ejected from the hammer or riveter and to return it for the next blow so that the cutting may be rapid and cont nuous.

The invention consists essentially 1n an attachment for supporting the cutting tool and in the sub-combinations and arrangements of parts whereby the tool 18 supported and guided in the attachment and driven from the source of power.

In the accompanying drawing one complete example of the physical embodiment of the invention is illustrated showing a chisel or its'tool constructed and arranged accordin to the best mode so far devised for the practlcal application of the principles of the invention and it will be apparent that tools with different functions and designed for other purposes may be used instead of this cutting chisel illustrated.

In the drawings 2- v F i re 1 is a plan view of a machlne embodymg the invention showing it attached to the casing of a pneumatic hammer of a well known type.

Fig.2 is an elevation of the same.

Fig. 3 is an enlarged view of the cutting tool showing the adjustable collar mounted thereon.

Fig. 4- is an elevation of the handle end of stem is utilized to reciprocate or to push the chisel or tool 6 forward on its working stroke, the reciprocable movement of the pneumatic hammer being accomplished in the usual manner and as it is not a part of the present invention ,details of this construction are not herein illustrated.

The tool is supported and guided in an attachment or frame comprising essentially two parallel bars 7, 7 alined with a casing 1 and attached to the cylindrical barrel portion 2 of the casing through the instrumen tality of the sectional sleeve having bars or flanges 8 for the clamping bolts 9 and in this manner the attachment is supported rigidly from the pneumatic casing.

To give further support and rigidity the parallel bars 7,7 are extended along the sides of the pneumatic tool and engage the tool at the junction of the handle 10 and the cylinder 1, a shoulder 11 being provided on the parallel bars and the bars extending therefrom in the form of bolts which take the place of the usual bolts that hold the handle and barrel of the pneumatic tool in fixed relation. At the farther or forward end of the frame a sectional head is used to join the ends of the bars and comprises the two sections 12 and 12 each section being formed with flanges 13 and 13 through which the bolts 14 are passed to hold the two sections around the chisel or tool. These bolts also provide means for securing the handle 15 by which means the tool is guided in its work.

At 16 the tool or chisel is provided with a squared surface of approximately the same cross section as the square opening 16 of the forward lugs 12 and 12 and this portion of the tool is supported and guided in its reciprocable movement in the sectional lugs 12 ner. Preferably the tool is operated at an angle, but in order to work closely with the grain or against the surface being operated upon, the chisel or tool in its preferred form is offset as illustrated in Figs. 1 and 3 so that when necessary the tool may perform an extremely thin out and guide itself in the manner of a plane or chisel, but rest the under side flat in the path of the work performed.

The outward working stroke of the chisel is imparted thereto by the power driven hammer through its stem 4 and through the stem 18 of the chisel or tool, but the return stroke of the chisel is not accomplished by the hammer but is I automatically. accomplished as follows Near the inner end of the chisel 6 an an-' nular collar 19 is supported to the stem or shaft by means of screw threads 20, these threads extending for some little distance on the stem to provide adjustability of the collar over a portion of the length of the stem. A spiral expansion spring 21 is fitted over the stem of the tool 6 with its forward end engaging the forward lugs 12 and 12 and its opposite end engaging the adjustable collar 19. Thus the stem of the chisel or tool, by reason of the force exerted by the expansion spring 21, will be held closely engaged in the socket of the stem 4 and will automatically return the tool after the forward or working thrust has been imparted by the hammer. Depending upon the work in hand the adjustable collar 19 may be positioned at any desired point along the stem to give the best working results. In case that the spring should become weaker this same collar will serve to effect the proper adjustment and to at all times keep the tools in proper working condition.

This arrangement and connection between the chisel and the hammer barrel extension provides a simple, but efficient and effective return stroke mechanism whlch coacts in correct manner w1th a motive flu d hammer,

poses but constructed with a shank substantially as above described and actuated in the same manner as this chisel may replace the tool herein shown.

I claim I 1. The combination with a power driven device having a reciprocable driving member, of a detachable frame secured to the de-' vice including a cross head and guiding handle supported in advance of the power device, a tool reciprocable in the head and supported in the device and adapted to be actuated by the driving member for its working stroke, and expanding means for returning the tool. I

2. The combination with a power driven device having a reciprocable driving member, of a supporting frame secured to the power driven device and extending therefrom, said extension having a cross head, a guiding handle thereon and a tool reciprocable therein, and actuated for its operating stroke by the driving member, and a return expanding spring suspended between the tool and its frame with adjustable means on the tool for tensioning the spring.

3. The combination with a powerdevice and its reciprocable driving member, of a supporting frame attached to the barrel and to the handle of the power device having on its outer end a cross head extending beyond the power device, a tool reciprocable in the head and actuated by the driving member for its working stroke, an expansible spring passing around the shank of the tool and engaging the cross head, and an adjustable collar on the tool to return said tool for the necessary working thrust.

4. The combination with a barrel with a power device and its reciprocable driving member, of a frame attached to the barrel and to the shank of the power device, carrying on its outer extending end a cross head, a tool with an enlargement reciprocable in said cross head and having a stem movable in the barrel and coacting with the driving member, an expansion spring encircling the tool and engaging the cross head and an adjustable collar on the tool to return the.

tool for the working strokes, and a handle supported on the cross head members to guide the chisel or tool.

In testimony whereofI affix my signature.

ALBERT HUNTER. 

